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3 years ago

Solve the quadratic equation 30 + x - x2 = 0

Mathematics

1 answer:

andrezito [222]3 years ago

6 0

Answer:

Step-by-step explanation:

x^2 - x - 30 = 0

Since by simple trinomial factoring:

(x-6)(x+5)=0

x = 6 or x = -5

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6. The value of (tan 1° tan2º tan 3º ... tan 89°) is

Thepotemich [5.8K]

Answer:

Step-by-step explanation:

Using the trigonometric identities

tan(90 - x) = cotx , cotx = $\frac{1}{tanx}$

Given

tan1tan2tan3....................... tan87tan88tan89

= tan1tan2tan3............... tan(90-3)tan(90-2)(tan90 - 1)

= tan1tan2tan3.............. cot3cot2cot1

= tan1cot1tan2cot2tan3cot3 ........................

= 1 × 1 × 1 ×....................... × 1

= 1

4 0

3 years ago

10+4x =12+3x How is this solved?

soldier1979 [14.2K]

Answer:

x=2

Step-by-step explanation:

$10+4x=12+3x$
$10+4x-3x=12+3x-3x$
$10+x=12$
$10+x-10=12-10$
$x=2$

FINAL ANSWER

x=2

8 0

3 years ago

Read 2 more answers

If 43 of the 148 reams of paper purchased by a department are used, what is the percentage that remains?

Wewaii [24]

100%/x%=148/43
(100/x)*x=(148/43)*x - we multiply both sides of the equation by x
100=3.44186046512*x - we divide both sides of the equation by (3.44186046512) to get x
100/3.44186046512=x 
29.0540540541=x 
x=29.0540540541

now we have:
43 is 29.0540540541% of 148

3 0

3 years ago

Read 2 more answers

In 36 years, amy will be 3 times as old as she is right now. how old is she now?

Bezzdna [24]

She would be 12 years old as 12•3 is equal to 36 years. (:

7 0

3 years ago

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Sophia uses 18 beads to make a necklace. Three sixths of the beads are purple. How many beads are purple?

joja [24]

Answer: